package servlet;

import pojo.User;
import service.UserService;
import service.impl.UserServiceImpl;
import utils.Page;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;
//注解
@WebServlet(urlPatterns = "/user")
public class UserServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        // 创建业务层对象
        UserService userService = new UserServiceImpl();
        // 1请求编码设置
        req.setCharacterEncoding("UTF-8");

        String action = req.getParameter("action");
        //判断action来区分是哪种操作
        if ("list".equals(action)){//执行查询操作
            // 获取参数
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");

            User condition = new User(name,pass);
            //接受当前页的参数,没传是null
            String currentPage = req.getParameter("currentPage");
            //int current = currentPage==null?1:Integer.parseInt(currentPage);
            if(currentPage==null){
                currentPage = "1";
            }
            int int_currentPage = Integer.parseInt(currentPage);

            //创建分页对象
            Page page = new Page();
            page.setCurrentPage(int_currentPage);
            //查询用户表的记录总数
            int count = userService.count(condition);
            page.setTotalCount(count);
            page.setTotalPage();

            //计算 偏移量
            int pageSize = page.getPageSize();
            int offset = (int_currentPage-1)*pageSize;

            List<User> users = userService.findAll(condition,offset,pageSize);

            //将数据放到作用域中，可以在jsp页面中取出使用
            req.setAttribute("users",users);
            req.setAttribute("condition", condition);
            req.setAttribute("page", page);
            // 在哪个页面显示数据
            req.getRequestDispatcher("/list.jsp").forward(req, resp);

        }else if ("delete".equals(action)){
            // 获取参数
            String sid = req.getParameter("id");
            int id = Integer.parseInt(sid);

            int result = userService.deleteUserBuId(id);
            if(result>0) {
                //重定向
                resp.sendRedirect("user?action=list");
            }
            else{
                resp.sendRedirect("addUser.jsp");
            }
        } else if ("add".equals(action)) {
            // 获取参数
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");

            int result = userService.addUser(new User(name,pass));
            if(result>0) {
                //重定向
                resp.sendRedirect("user?action=list");
            }
            else{
                resp.sendRedirect("addUser.jsp");
            }

        }
        else if ("update".equals(action)) {
            // 获取参数
            String sid = req.getParameter("id");
            int id = Integer.parseInt(sid);
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");

            int result = userService.updateUser(new User(id,name,pass));
            if(result>0) {
                //重定向
                resp.sendRedirect("user?action=list");
            }
            else{
                resp.sendRedirect("addUser.jsp");
            }

        }
        else if ("toupdate".equals(action)) {
            // 获取参数
            String sid = req.getParameter("id");
            int id = Integer.parseInt(sid);
            //TODO 创建业务层对象
            User user = userService.findUserById(id);
            //将数据显示出来

            //把数据放到请求域中
            req.setAttribute("user",user);
            //在哪个页面显示数据
            req.getRequestDispatcher("/updateUser.jsp").forward(req,resp);

        }

    }
}
